同或的逻辑表达式为：（ ）
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 逻辑函数F(A,B,C)=AB+BC+AC的卡诺图为（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/7a8254757f8a4fc6ab82fa93a8e86ebf.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/229cbcade3654fb99c66a7c102ec046f.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/1c851f1288be499c92d2a7b40607bd1a.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/3b385269839a45df9645db71096c2e81.png" />
- 图中尺寸标注正确的是（） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/c27b2c5bcd5248d2938ff20dcadb3848.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/283d8966e68e476a835df10a7001fa1b.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/99cfc288fcb64fd282a9ad41acac2e70.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/c8163178d3cb46f98f20b4c79e872b18.png" />
- 下列尺寸标注正确的是（） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/c9b1f998550f46f2954ddb9a6e931917.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/2ebdcfcbd422486e8f52decd4b1f3c91.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/713b97186b2a4602a111ab988359072b.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/d21403f12f034db3b26192a552f8f9c1.png" />
- 下面的投影图中表示交错直线的是（） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/abd70ceaf2b1417f8db7dcbdafe06a4e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/69c37bc573b34b00829846f0d05b1b8e.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/467d9b64267e4a99928004e28e8ce78f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/ab49baad1d7f4b4bbfd286c3225870bb.png" />
- n个变量的逻辑函数一共有最小项（ ）个。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/bc6b2e9c189248feb007810275b3ba46.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/a04259d5f82c487eb3fe219bdfe142fd.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/994cb971d6b0496e97023da8982c9ee1.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/c7dc4e3adc954375b97a1f5f805272cc.png" />